Hi guys
engine now running but spewing oil out of both cans-- only light blue haze from the left but obscuring smoke from the right hand even after 20 mins warm up The more it was revved the more of a smoke cloud from the r/h can and both cans still spraying oil.
General concensus is crank seals gone and r/h prob sucking in gearbox oil as well.SILLY QUESTION to which i probably know the reply----can you replace the seals without splitting the cases>
I read the manual through re disassembly of bottom end but photos and text seem to jump stages and aren`t really that explanetery.
A blog with a series of pics on this subject would be great ---any takers?

ok fella thanks for the reply--i hope some clever geezer on here has found a way to do it and lets us know--you never know with a bit of luck it may not be the seals leaking--has anyone used a leak down test kit to confirm this problem??

hi jarno thanks for the reply--bit strange this one----i changed the right hand carb(still don`t know why)For a spare i had lying around to see if the engine would start after weeks of possible ignition problems and still no start but now plenty of spark----i gave it one kick and the engine burst into life.
the engine did NOT blow smoke or oil spray previously when it was running until i fitted this r/h carb!!!!!!!!!!!!!!!!!!!!!!!!!!!
tomorrow i will refit the original carb and we will see what we will see(probably through a blue haze!!)

hi i got the cog off using a sturdy bearing puller from jago, on amazon about 30 quid ,first i punched a straight line from cog to end of shaft using an i letter from letter punches as a reassembling guide,then pulled it off using puller.

Yes Jarno-- i thought that might be the case(no pun intended!!)i`ve just found a picture of a seal and i can see that it has a raised profile on the outer seal surface obviously there to lock the seals in place under compression.
Lets hope i don`t have to fork out for a crank rebuild and the smoky cans settle down with a little more running at temperature.